DIAC symbol
Also called Trigger diode, Bidirectional trigger diode
A two-terminal device that conducts in either direction once a breakover voltage is reached. It is used to trigger a TRIAC.
ANSI / IEEE
IEC 60617What the DIAC symbol means
A two-terminal device that conducts in either direction once a breakover voltage is reached. It is used to trigger a TRIAC.
ANSI and IEC symbols
Where you see it
Trigger circuits for TRIACs in dimmers and AC power controllers.
Related symbols
Frequently asked questions
What does the DIAC symbol look like?
On ANSI drawings: Two opposite triangles between two bars, with no gate. In IEC 60617: The same symbol.
Is the DIAC symbol the same in IEC and ANSI?
Yes, it is drawn the same way in most legends.
Where is a DIAC used?
Trigger circuits for TRIACs in dimmers and AC power controllers.
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